Has anyone confirmed that you can add a 9070 rear derailleur to 6770 and it will support 11 speed?

The RD dictates the number of total speed for the system, so the answer to this question is a "Yes" but it has a contingency. You have to update to the latest firmware (multi-shift compatible) in order for the 6770 shifters to recognize the 9070 RD. Non of this is "officially" compatible, by the way.

Unofficially speaking, you "can" get it to work but it is not recommended as the 6770 FD does not have the micro-adjust feature to allow micro-trimming of the FD to accomodate the extra cog and added FD cage travel/movement. Again, Shimano is not, will not, and has not suggested this as a compatible combination of components - experiment at your peril/non-compatibility.

New firmware for Ultegra Di2 6770 just came out. Dated April 9, 2013, description is "enhancement of function" and for the battery mount dated March 26, 2013, "Improved stablility of unit communication, Enhancement of energy-saving".

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